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UTIME(2)                   Linux Programmer's Manual                  UTIME(2)

       utime, utimes - change file last access and modification times

       #include <sys/types.h>
       #include <utime.h>

       int utime(const char *filename, const struct utimbuf *times);

       #include <sys/time.h>

       int utimes(const char *filename, const struct timeval times[2]);

       The  utime()  system  call  changes  the access and modification times of the inode
       specified by filename to the actime and modtime fields of times respectively.

       If times is NULL, then the access and modification times of the file are set to the
       current time.

       Changing  timestamps  is  permitted when: either the process has appropriate privi-
       leges, or the effective user ID equals the user ID of the file, or  times  is  NULL
       and the process has write permission for the file.

       The utimbuf structure is:

           struct utimbuf {
               time_t actime;       /* access time */
               time_t modtime;      /* modification time */

       The  utime()  system call allows specification of timestamps with a resolution of 1

       The utimes() system call is similar, but the times  argument  refers  to  an  array
       rather  than a structure.  The elements of this array are timeval structures, which
       allow a precision of 1 microsecond for specifying timestamps.  The  timeval  struc-
       ture is:

           struct timeval {
               long tv_sec;        /* seconds */
               long tv_usec;       /* microseconds */

       times[0] specifies the new access time, and times[1] specifies the new modification
       time.  If times is NULL, then analogously to utime(), the access  and  modification
       times of the file are set to the current time.

       On success, zero is returned.  On error, -1 is returned, and errno is set appropri-

       EACCES Search permission is denied for one of the directories in the path prefix of
              path (see also path_resolution(7)).

       EACCES times  is  NULL,  the caller's effective user ID does not match the owner of
              the file, the caller does not have write access to the file, and the  caller
              is  not  privileged (Linux: does not have either the CAP_DAC_OVERRIDE or the
              CAP_FOWNER capability).

       ENOENT filename does not exist.

       EPERM  times is not NULL, the caller's effective UID does not match  the  owner  of
              the  file,  and  the  caller  is  not  privileged  (Linux: does not have the
              CAP_FOWNER capability).

       EROFS  path resides on a read-only file system.

       utime(): SVr4, POSIX.1-2001.  POSIX.1-2008 marks utime() as obsolete.
       utimes(): 4.3BSD, POSIX.1-2001.

       Linux does not allow changing the timestamps on an immutable file, or  setting  the
       timestamps to something other than the current time on an append-only file.

       In libc4 and libc5, utimes() is just a wrapper for utime() and hence does not allow
       a subsecond resolution.

       chattr(1), futimesat(2), stat(2), utimensat(2), futimes(3), futimens(3)

       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-

Linux                             2008-08-06                          UTIME(2)

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